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Fluidal structure — Fluidal Flu id*al, a. Pertaining to a fluid, or to its flowing motion. [1913 Webster] {Fluidal structure} (Geol.), the structure characteristic of certain volcanic rocks in which the arrangement of the minute crystals shows the lines of flow of… … The Collaborative International Dictionary of English

Fluidal — Flu id*al, a. Pertaining to a fluid, or to its flowing motion. [1913 Webster] {Fluidal structure} (Geol.), the structure characteristic of certain volcanic rocks in which the arrangement of the minute crystals shows the lines of flow of thew… … The Collaborative International Dictionary of English

Volcanic rock — is an igneous rock of volcanic origin. Texture Volcanic rocks are usually fine grained or aphanitic to glassy in texture. They often contain clasts of other rocks and phenocrysts. Phenocrysts are crystals that are larger than the matrix and are… … Wikipedia